Bond traders are on guard for an especially volatile Friday as a pivotal US jobs report and a potential Supreme Court ruling on President Donald Trump’s tariffs threaten to jolt the Treasuries market out of its doldrums. First up is the 8:30 a.m. Washington time release of December employment figures, a highly anticipated report seen as finally giving a reliable reading on the economy after weeks of data affected by the government shutdown. The figures will either cement expectations that the Federal Rese ...